Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "heat: add port name as port"
  - heat: add port name as port

    Change-Id: Ibd159359c6f57d573a909d6841c121c15bf692c1
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index e49f9ef..27d977d 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit e49f9eff83fe3a610fc95aee197938ac3158a0b7
+Subproject commit 27d977da08dced6d9752c95c2561c5b9d749ebbc